Process of manufacturing seam caps



A g- 10, 1943. c. D. BONSALL I 2,326,283

PROCESS OF MANUFACTURING SEAM CAPS Filed March 24, 1941 Patented Aug. 10, 1943 preparatory to pressing,

' i seesaw is Company, a corporation of Delaware s l Am l h M invention relatesto seam of the kind used in connection with lthestanding seamsof ra lway freight cars. ,Seam ,caps ofthis type not .only protect the seam from the entry o fzw'ater, einders and the like but mayalsoqbe' made to seoperate with .Other m m .e th am c stmction so a together to function as load carrye ner; of carlines., For .the effective performance of the carline function, it is desirable to make the seam caps of thick sheets or plates; but, while it is practicable to press a galvanized sheet of one-sixteenth of an inch thickness into a. suitable shape for asea'm cap without causing the zinc to fiakefrom the base metal, it is not practicable to dothe same with thicker sheets orplatesbeing members of the roof structure after the rjnanf onsalL ChicagogIlL; assigiibr to Standard ltaiiwayjEquipmeht Manufacturing fi h pa e 24, 194i, seriarNbI assess f} fa c =i iiis.z (ct gs s i I 7 which functions as an outsi cause of the risk of the zinc flakin therefrom.

Thep-rincipal object of the present h vention isto devise a galvanized sheet metal se-aim cap-"fi jof greater thickness than has heretofore. been practicable and to devise a method of producing such seam cap. The invention consists-principally in a sheet metal seam'cap composed of a galvanized metal outside sheet and a second sheet. I insidezthereof which are simultaneouslypressed into shape. Ital'so consists in 'ducing said the process of proclaimed. The seam cap claimed in application Serial No. 442,349, filed May's), 1942. 5

' In the accompanying drawing, wherein like symbols refer to like parts wherever they occur,

Fig. 1. is a vertical transverse section through a car rco-i having an upstandingseam construction including ticn, v I V Fig. 2 is an enlarged vertical cross-section in Fig. 1', V v V Fig. 3 is a perspective view, showing portions of two sheet'metal seam cap blanks, one superposed on the other on thedie of a power press;

Fig. 4 is a. cross-section of the seam cap pro} duced by pressing the two blanks simultaneously in said press; and r a Fig. 5 is a perspective view of'a portion of the seaincap. 7}, I In the accompanying drawing, m invention 1s shown embodied in the upstanding seam con-.-

struction of a metal car roof comprising roof a seam cap embodying my inventhrough said seaim construction on. the 1ine2- -2 seam cap hereinafter describedand rib portion oitheseamcoverl). rib extends v v.

- roof sheets A seams that extend from.

i h Ki sii h sea we 2 st ad l s' -a d is riveted to thegupstandmg 's and. hasl wgnrtstariding b on the} body portions of "that 55? 7 eet y when two s d io'i v mlt g ei n aiir h beingsomewhat longerthan the seam when the 'seamc'ap is tob'e turned down at-the eaves and eing somewhat shorter than thewidth of theherein sometimes called vanized nietalsheet of g sixteenth of an-inch or; less, fthesegblanks' bein of tock material galvanized on both of the two blanks simultaneously into the drawing die liand thereby forms therein thedeep hollow the full' length of theblanksj or nearly the full length according to the design of the end portions w l V I pressing, the. side -portion s of of the die.. After 1 the blanks project i transversely. I at substantially.

sheets A that extend from side plate B to side .plateB of thecar and have upstanding'flanges.

Calongtheir adjacent margins that are rigidly connected by-an upstanding hollow rib or cap D so as together to form said seam construction panels Ethat overhang right; angles to then'b of members are-so designed. as to give the seam cap a camber to conform' to the slope'of the roof;

Preferablyalso the outer side margins of'theoutside blank 2 extend beyondrthe outersidem rgme "of the inside blank I and are of said last mentioned'margins; so th finished seam cap, to form depressed side margin 1 I n l r t e side edges; r

of said inner blank.

By' using a galvanized sheet] that isno'thicker than one-sixteenth'of aninch; the danger of the zinc fiakingioif is substantially elminated; and by die-pressing therewith another sh'eetfwhichi snugly fits and cooperates. withthe galvanized.

' sheet; they'constitute a unitary twoeply seam cap fgreater-strengththan could be assembly of much 5-1 decarline. {is shown earn flange p, th 1 s mft n D I e s bb .v'sl yzfi e ae hz -f t e the Sal'he asfthe Widthof L i the length-of the roof eave to caves of the car;

the seam cap Dfto' form f i I the base flange'E thereof. "Preferably, the die" disp o'se d in the plane J formed out ofa single thick galvanized sheet without injury to its zinc coating. V WhatIclaimisz' 1. The process of making capsior the seams or a railway freight car rooLeomprising placinga first blank of corrosion-resisting sheet metal. on a hollow rib-forming die member, superpos ing centrally on the first blank axsecond sheet -:nretal blank; with the edges ofthe second blank 7 spaced inwardly from the edges of the first blank, and then unitarily die pressing said blanks while; 7 in superposed relation into said iorming die mem- V her to form an elongated-hollow U-shaped rib whose free edges terminate inlatera lly e'xtending side portions in which the edges of thefirst-blank extend beyond the edges of the second'and bende ing the edges of the first blank over the edges of 'thesecon'd; l

; thickness centrally over arhollowrib-forming die '.'inember of symmetricalcross-section, superposing centrally on the first'blankfa second flat bank of ungalvanized' metal with the edges of the sec--,

-2. The process of making seam caps fonthe= seams of a railway freight car roof, which con; sistsin-plac'ing a first blank of corrosion-resisting'inetal on a hollow rib 'form'inggdie member,

sheet metal blank with the edges of the second superppsing'centrally'onthefirst blanka second to one'anotherj, and then unitariare bent and pressedtogether' in tight non slip" elongated, hollow,

the edges of the second and bending the edges of v the first blank over the edges of the second.

73. The process of making caps for the seams V of a railway freight car roof, whichmonsists in placing a first flat blank'ofjgalyanized sheet metal of no more than one sixteenth of an inch in 0nd blank spaced inwardly from the edges of the first blank and said blanks being unbonded and I free to-sliprelative to one another, and then unitarily= die, pressing said blanks, while so superposed into saidforming die member until'said blanks' are bent and pressed together in'tight, non-slip engagement with one another in the form 'of -an elongated',holl'ow, U-shaped member whose'gfree edges terminate in laterally extending side portions in which the edges of the gal-'- vanized'first blankextend beyond the edges of the "second, ungalvanized blank and bending the -,edges"of thefirst blankoyer' the edges ofthe second. 1= V CHARLES DAVID BONSALLQ another in the form oi an- 

